Engineers in Venice have successfully tested a new flood barrier that they hope will protect the city. The BBC reports that the first four flood barriers of a planned 78 were floated in the entrance of the city’s famous lagoon.

Venice suffers annual floods due to unusually high tides that threaten irreplaceable buildings and a destination essential to Italy’s tourism industry. It’s also sinking at a rate of one to two millimeters a year, Discovery Magazine reports.

The barrier isn’t complete and has already cost $7 billion. It will take another $800 million and two years more work before it can protect the city. While Italy is suffering badly from the global economic crisis, the government has promised to complete the project by 2016.